21035334205 has 4 divisors (see below), whose sum is σ = 25242401052. Its totient is φ = 16828267360.

The previous prime is 21035334191. The next prime is 21035334209. The reversal of 21035334205 is 50243353012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8745616324 + 12289717881 = 93518^2 + 110859^2 .

It is not a de Polignac number, because 21035334205 - 2⁷ = 21035334077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035334209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2103533416 + ... + 2103533425.

It is an arithmetic number, because the mean of its divisors is an integer number (6310600263).

Almost surely, 2^21035334205 is an apocalyptic number.

It is an amenable number.

21035334205 is a deficient number, since it is larger than the sum of its proper divisors (4207066847).

21035334205 is an equidigital number, since it uses as much as digits as its factorization.

21035334205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4207066846.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21035334205 its reverse (50243353012), we get a palindrome (71278687217).

The spelling of 21035334205 in words is "twenty-one billion, thirty-five million, three hundred thirty-four thousand, two hundred five".